System of control.



"No. 873,351. PATBNTED DEC. 10,1907; F. DARLINGTON & 0. S. SOHAIRER.

SYSTEM OF CONTROL.

APPLICATION FILED MAR a 1906 WITNESSESz' $014M v ATTORNEY LiNo'roN and One S.

UNITED s FREDERICK DARLINGTON AN D OTTO r. SCltl AlPtl'lR, OF PITT Ol S TO WESIIN lllOUSE PENNS YLVANIA.

lELECllllC a; MAN UFAk'llURIh-"G COMPANY, A

SYSYI'EM OF CONTROL.

Specification of Letters Patent. Application filed March 3.

Fatentorl flee. 10, 130K. 1906. Serial No. 304.018x

To all whom it may concern.

Be it known that we, Fmannarcr'; DAR- Sormmnn, citizens of the United States, and residents of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Systems of Control, ol. which the following is a specification. Our invention relates to systems of control for electric motors and it has for its object to provide novel and improved means whereby the movement of one or more electriomotors may be caused to correspond in direction and .to be accurately proportional in extent to the movements of a master con troller. I

The single figure of the accompanying drawing illustrates, diagrammatically, a system embodying our invention.

A. shaft lthat is o eratively connected to any suitabledevice giiot shown), the movements of which it is desired to govern accurately, is adapted to be operated by an electric motor 2, one terminal of the armature 3 of which is connected to an intermediate or neutral point 4 of a suitable source of energy such as a battery 5. The field magnet winding 6 of the motor is connected between the terminals or other points of the battery, or it may be energized from any other suitable source. The other terminal of the armature 1 is connected by means of a brush 7 to a'contact arm 8 that is adapted to be moved. by the motor over a set of stationary conducting segments A, B, C, D, E, F and G, that are respectively connected to corresponding stationary contact terminals A, B, C, D, E", F and G of a manually operated controller 9. The controller 9 comprises, further, contact terminals B and B that are respectively connected to the positive and negative ten minalsof the battery, and two conducting segments 10 and ll that are adapted to engage the stationary contact terminals thereof in the positions indicated by the lines I), c, d andfand b, c, d andf.

If, when the switch arm 8 engages the con.- ducting segment D, it is desired to cause the device that is operated by the motor to occupy a position such that the arm 3 will engage conducting segment F, the conducting segment 10 of the controller 3) shouldv be moved to the position indicated by the lincf, whereupon a circuit will be established from the neutral point 4 of the battery through the devices bearing reference characters 3, '2, 8, D, l), andB.

ducting conducting segment Contact terminals Eand ll. continue to operate until the switch arm 8 moves from the couductihg segment F to the adjacent segmentnG, whereupon the motor circuit Wlll be interrupted." If the'controller had been moved only to position a the arm would have been operated until it had passed overthe segment to the segment F, and it might then have been caused to move from the segment F to segment G by moving the controller to the position f.

If, when the switch. arm 8 engages the ment G, it'is desired to operate the me riser controlled by the shaft 3 in such diree i w s to cause the stretch arm. 8 to move to ti the conducting segment 11 of the cont; 9 should be moved to the left to the tion corresponding to the extent of movo'm i that it is desired to impart to the 0 ol member. A circuit is then estabhs ed way of the devices indicated by the characters 5, B 11, G, G, r 7, 3

will thus be observed that the motor armature is traversed by the current m a reverse direction from trait in which. it was traversed when. the conducting segment 1'!) engaged the corresponding contact terminals, consequently, the direction of rotatior motor is reversed.

meat '11 is movedmotor will continue switch. arm 8 engages If the conducting 1 to the position "i to operate untn the stationary segment A, whereupon the motor circuit will be interrupted. Thus it is seen that the direction of I rotation of the motor 2 1S dependent upon the direction of movement of the controller 9 and that the number of rotations thereof or the extent of movement of the member operl ated thereby, is accurately proportional. to the extent of movement or the controller. The battery 5 may obviously be replaced by a transformer, a motor generator or any other source of energy having a neutral point. By the emphiynient of a source of I energy having a neutral. point and the arl rangement of the circ uts herein shown and described a separate rc ersmg switch for tl 1o motor is unnecessary and consequently the i.

SBURG, PENNSYLVANIA, ASSIGN- CORPORATION 0F 7 l The motor 3 will then operate so as to move the arm 8 over the consegment E, when the circuit will re'-' main established as before, except that it will traverse from the switch arm 8 to the i0 byway of stationary The motor will system is less complex than others heretofore provided. Another advantage is that a constant potential is su plied to the motor.

The main switch may, i desired, be replaced by a plurality of individually actuated switches that are suitably interlocked, or the direction and extent of rotation of the motor may be governed in any other suitable manner.

The structural details and arrangements of the parts maybe varied in other respects without modifying the mode of operation of the invention or departing from its spirit and we desire that all such modifications be included within its scope. 7

We claim as our invention:

1. The combination with a source of electrical energy and a motor having one terminal connected to a neutral or intermediate point thereof, ofa set of conducting segments, means operated by the motor whereby its other terminal may be connected to the conducting segments, and means whereby the conducting segments ma be connected to the one terminal or the ot er of the source.

2. The combination with a source of electrical energy and a motor having one terminal connected to a neutral or intermediate point thereof, of a set of conducting .segments, means operated by the motor whereby its other terminal may be connected to I trical energy and a motor having one terminal connected to a neutral or intermediate point thereof, of a set of conducting segments, means operated by the motor whereby its other terminal may be connected to the conducting segments, and means whereby the end segments of the set may be connected, respectively, to the terminals of the source and whereby the intermediate segments may be connected to the one terminal or the other of the source.

In testimony whereof, we have hereunto subscribed oun names this 21st day of February 1906.

FREDERICK DARLINGTON.

OTTO S. SCHAIRER. Witnesses:

WESLEY G. 045KB,- BIRNEY HINES. 

